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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aca8e7c298bde0866ce0eaf23e7938d3953eb4453db3e70d52d5dc2d7e5cd41' 
  AND token = 'ql+Rofu6IVaRG4EGiXNGO/6b2LcJQITr4urCGPTbUN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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