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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2b36a8f317c2f27e2be6d72657255781ff6d4613d4b5fb48b58551f024f743' 
  AND token = 'XCPc4CJCWQ2oH6PPCNzCTM8Ltqk3I6Bdrr7Iud+zjl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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