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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06d7c4e4c3d76133555898a1ae9ba883d3dd982c149e72bc377800b382c7580' 
  AND token = 'xdkPPA3yJUlUUIBoij9C4iQt9jehLUB/WP8byMpdnLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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