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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f94199416f5790e588507601165aad7ce232c23d6d61e2f0cb5855c7568a223' 
  AND token = 'IQ5OTUTizULhZsLVYVTrpuknAMOiII+3Jz8e0VklSk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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