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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0d4fe4bdec34d5542e97aeb7f246b8524a0f9c4f2a3c5a0fd45317a69392ad' 
  AND token = '2+k+XSBJE7XS2jSr4x3nKLPH5Rp5jL/uf/DmHusJmv0=' 
  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"
    }
  }
}