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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56263b35ecb03c9bc11f7a862c6e8ce3f6ced0e8d28ffaf7bae5823a0ca3c9a' 
  AND token = 'zs8A5B/pYPKLxICpSQy3ACuEd2CJnQiMy1gVp+kptxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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