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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758a4d60ce56e1d468bf6472bba5351b270b29c218483d10ef7d490cc0bd3e0b' 
  AND token = 'G/izyYUv4hkRapx7QkHEoE6eSzfV1nWobwNoCOpfHS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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