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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a98f8fcfbd1c0d781b979074b503e21b26d767c9354c9964bd08a0b414ccaad' 
  AND token = 'FfkCLA83cJhnHoKydffOF7IENdV+iVb5J67n66hG0aE=' 
  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"
    }
  }
}