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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c1f2fa4e92076bad65b73a5508055c9f79c34fb52dc30045e90fd4116ddba1' 
  AND token = 'AugzsfVwH7tcD6JDwy+4Q5PVZkrkHcuXRoNo8qkKLIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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