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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b55fad449e1178e9c512775c1e5bb3f15e66453acc0fcb940eabd18362cb600' 
  AND token = 'igv62ZstMwEG3KBqmQOY3slVUJ9T1q8VcfG1J7Cr1RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}