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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac4d93c023fc66df5f9e1d5e9eaa12e8018f525176c31d555409e2a30acc291' 
  AND token = 'YIFR6paszGRtBQ5SrO4YyBwaXk3Jg4T7rZqBMq2gMOg=' 
  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"
    }
  }
}