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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d9a7aa93f3a6dad387c97bce87198b4070ec03bd09d9b9dc67cf053823e395' 
  AND token = 'S2OmKnQwMmDvq4E6f+0R7qJar842IHP4AJxH0jCCJJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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